package com.traveldesign.interceptor;

import com.traveldesign.common.JwtClaimsConstant;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.JwtException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import com.traveldesign.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader("token");
        // 超级管理员直接放行（开发环境专用）
        if (token.equals("wangwang")) {
            return true;
        }
        //2、校验令牌
        log.info("jwt校验:{}", token);
        if (token == null || token.isEmpty()) throw new JwtException("请先登录");
        Claims claims;
        try {
            claims = JwtUtil.parseJWT(token);
        } catch (Exception e) {
            throw new JwtException("token无效");
        }
        String userId = claims.get(JwtClaimsConstant.USER_ID).toString();
        log.info("当前登录用户id: {}", userId);

        //3、通过，放行
        return true;
    }
}
